could spot-weld
Regular verb: spot-weld - spot-welded- spot-welded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could spot-weld
you could spot-weld
he could spot-weld
we could spot-weld
you could spot-weld
they could spot-weld 	I could be spot-welding
you could be spot-welding
he could be spot-welding
we could be spot-welding
you could be spot-welding
they could be spot-welding	I could have spot-welded
you could have spot-welded
he could have spot-welded
we could have spot-welded
you could have spot-welded
they could have spot-welded	I could have been spot-welding
you could have been spot-welding
he could have been spot-welding
we could have been spot-welding
you could have been spot-welding
they could have been spot-welding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not spot-weld
you could not spot-weld
he could not spot-weld
we could not spot-weld
you could not spot-weld
they could not spot-weld 	I could not be spot-welding
you could not be spot-welding
he could not be spot-welding
we could not be spot-welding
you could not be spot-welding
they could not be spot-welding	I could not have spot-welded
you could not have spot-welded
he could not have spot-welded
we could not have spot-welded
you could not have spot-welded
they could not have spot-welded	I could not have been spot-welding
you could not have been spot-welding
he could not have been spot-welding
we could not have been spot-welding
you could not have been spot-welding
they could not have been spot-welding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I spot-weld?
could you spot-weld?
could he spot-weld?
could we spot-weld?
could you spot-weld?
could they spot-weld? 	could I be spot-welding?
could you be spot-welding?
could he be spot-welding?
could we be spot-welding?
could you be spot-welding?
could they be spot-welding? 	could I have spot-welded?
could you have spot-welded?
could he have spot-welded?
could we have spot-welded?
could you have spot-welded?
could they have spot-welded? 	could I have been spot-welding?
could you have been spot-welding?
could he have been spot-welding?
could we have been spot-welding?
could you have been spot-welding?
could they have been spot-welding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not spot-weld?
could you not spot-weld?
could he not spot-weld?
could we not spot-weld?
could you not spot-weld?
could they not spot-weld? 	could I not be spot-welding?
could you not be spot-welding?
could he not be spot-welding?
could we not be spot-welding?
could you not be spot-welding?
could they not be spot-welding? 	could I not have spot-welded?
could you not have spot-welded?
could he not have spot-welded?
could we not have spot-welded?
could you not have spot-welded?
could they not have spot-welded? 	could I not have been spot-welding?
could you not have been spot-welding?
could he not have been spot-welding?
could we not have been spot-welding?
could you not have been spot-welding?
could they not have been spot-welding?